Lesogorsky (Russian: Лесого́рский; Finnish: Jääski; Swedish: Jäskis) is an urban locality (an urban-type settlement) in Vyborgsky District of Leningrad Oblast, located on the left bank of the Vuoksi River, on the Karelian Isthmus, near the Russia–Finland border, and a station of the Kamennogorsk–Svetogorsk–Imatra railway.

Jääski may have been mentioned in a Russian chronicle from 1137 as an area taxed by the bishop of Novgorod, but this identification has not been confirmed.

It is possible that the entire area of what became the Viipuri parish belonged to the Jääski pogost before the construction of the Vyborg Castle.

In 1917, Finland became independent, and the town became the administrative center of the Jääski municipality of the Viipuri Province.

The territory had been ceded by Finland to the Soviet Union by the Moscow Peace Treaty as a result of the Winter War.

[2] On November 24, 1944, Yaskinsky District was transferred from Karelo-Finnish Soviet Socialist Republic to Leningrad Oblast.